Renesas QS32X245Q2G

Overview

QS32X245Q2G from Renesas Electronics is a high-speed CMOS double-width bus switch with 16 bidirectional channels, 5Ω typical ON resistance, zero propagation delay, and TTL-compatible control inputs. It operates across –40°C to +85°C and supports voltage translation between 5V and 3.3V buses in hot-swap-capable industrial backplanes.

For engineers reviewing the QS32X245Q2G datasheet, QS32X245Q2G pinout, QS32X245Q2G application, or QS32X245Q2G equivalent, this device delivers deterministic signal isolation with no ground bounce, undershoot clamping on all I/Os, and flow-through pinout for PCB routing efficiency in dense bus architectures.

Technical Context

The QS32X245Q2G implements two independent 8-bit bidirectional bus switches (A0–A7/B0–B7 and A8–A15/B8–B15), each controlled by separate OE pins (OE1, OE2). Its enhanced N-channel FET structure eliminates inherent body diode conduction to VCC, enabling safe bidirectional voltage translation without latch-up risk.

Switching is governed by TTL-level control logic: low on OE enables corresponding channel pair; high places outputs in high-impedance state. Propagation delay is limited only by RC time constant of 5Ω RON and load capacitance - not internal logic - resulting in sub-0.25ns intrinsic delay at 50pF load.

Key Specifications

Pinout & Package

QS32X245Q2G is packaged in a 40-pin QVSOP (Quad Flat No-Lead, Very Small Outline Package) with exposed thermal pad, optimized for high-density PCB layouts and thermal dissipation in industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switching applications.

Compared with SN74CBT3245APWR and PI3CH400QE, the QS32X245Q2G uniquely combines dual independent OE control, 5V tolerance, integrated undershoot protection, and industrial temperature qualification - making it the only option for mission-critical hot-swap and mixed-voltage backplane isolation.

Availability

QS32X245Q2G is available at Aetrix Electronics and suitable for industrial backplane design, hot-swap module integration, and voltage-translation interface development requiring stable component supply and long-term lifecycle support.

Supply support for QS32X245Q2G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The QS32X245Q2G belongs to Renesas' QuickSwitch® bus switch product line, engineered specifically for zero-delay, bidirectional signal isolation in high-reliability industrial and telecom systems requiring hot-swap capability and mixed-voltage interoperability.

FAQ

What is the maximum operating voltage for QS32X245Q2G?

The QS32X245Q2G supports DC supply and signal voltages from –0.5V to +7V on all terminals except V_CC, which is rated for 5.0V ±5%. This extended range enables safe operation during 5V-to-3.3V translation and withstands transient undershoot events down to –3V due to integrated clamps. The QS32X245Q2G maintains specified R_ON and leakage performance across its full industrial temperature range.

Does QS32X245Q2G support bidirectional voltage translation between 3.3V and 5V domains?

Yes, the QS32X245Q2G supports true bidirectional voltage translation without direction control pins. Its enhanced N-channel FET structure lacks an inherent body diode to V_CC, preventing unwanted conduction when 3.3V signals drive into a 5V domain. The QS32X245Q2G delivers 3.7–4.2V pass voltage at 5V V_CC, ensuring full logic HIGH compatibility across both voltage domains.

How does the dual OE architecture of QS32X245Q2G improve system design?

The QS32X245Q2G features two independent output-enable inputs (OE1 and OE2), allowing separate control of its two 8-bit bus segments (A0–A7/B0–B7 and A8–A15/B8–B15). This enables granular isolation - for example, gating memory address lines while keeping data lines active. The QS32X245Q2G eliminates need for two discrete switches, reducing BOM count and PCB area in multi-bus systems.

Is QS32X245Q2G compatible with legacy 74'245 control timing?

Yes, the QS32X245Q2G replicates the functional behavior and timing envelope of the 74'245 transceiver, including active-low OE control and flow-through pinout. Its zero propagation delay and sub-0.25ns max t_PLH/t_PHL exceed 74'245 performance, and TTL-compatible inputs allow direct connection to legacy microcontrollers and FPGAs without level shifters. The QS32X245Q2G serves as a drop-in speed upgrade for existing 74'245-based designs.

What thermal and packaging advantages does the QVSOP package offer for QS32X245Q2G?

The QS32X245Q2G uses a 40-pin QVSOP package with dual V_CC and GND pins plus an exposed thermal pad, providing lower thermal resistance than standard SOIC or TSSOP. This improves power dissipation under sustained 120mA per channel loads and supports reflow compatibility for automated assembly. The QS32X245Q2G's QVSOP footprint enables high-density routing in space-constrained industrial modules while maintaining signal integrity across 16 parallel lanes.